Some people - including women's campaigners - have criticised the device for being "vengeful". Well, as its inventor, Sonette Ehlers, has said, it's "a medieval device for a medieval deed". If any rapist finds himself hopping with pain as a result - as well as facing the fact that the only way to remove the device is said to be a highly awkward and incriminating hospital visit - that seems just fine to me. Yes, it's vengeful. Yes, it hurts rapists. Oh well.

The device is "inserted with an applicator like a tampon, and removed with the same applicator," according to the Rapex. It can stay in for up to 24 hours. And it will be "available in various sizes... small, medium and large."

When should it be worn? "If you have to travel long distances alone, on a train, working late, going out on a date with someone you don’t know too well, going to clubs, or in any situation that you might not feel comfortable or even just not sure."

"The myth of the vagina dentata - vagina with teeth - has proved strangely compelling down the centuries, " the Guardian adds, "but who would have thought it would become real?"